Multimodal Transport Path Selection of Cold Chain Logistics Based on Improved Particle Swarm Optimization Algorithm

Table 8

Changes in the optimal path with railway transport cost.

Change rate of cost (%)	Optimal path	Proportion of railway mileage (%)
−20		71.40
−10		71.40
0		41.70
+10		33.71
+20		21.78

: Highway, : Railway, : Airway.